http://www.michigan.gov/documents/mdard/2013_DRAFT_SITE_SELECTION_GAAMP_392878_7.pdf
From the home page, you can get to each and every GAAMP.
http://www.michigan.gov/mdard/0,4610,7-125-1567_1599_1605---,00.html
Excerpts taken directly from the proposed new draft of the site selection gaamp
Animal Units....................... 50
Number of Animals:
Slaughter and Feeder Cattle 50
Mature Dairy Cattle 35
Swine *2 ........................*."For facilities with 50 animal units or more the minimum setback will be 250 feet for new livestock production facilities
"
Sheep and Lambs 500
Horses 25
Turkeys 2,750
Laying Hens or Broilers 5,000
All other animal classes, types or sizes (eg. Nursery pigs) not in this table, but defined in the Michigan Right to Farm
Act or described in Michigan Commission of Agriculture Policy, are to be calculated as one thousand pounds live
weight equals one animal unit
Category 1 sites are those sites which have been traditionally used for agricultural purposes and are in an area with a relatively low residential housing density.
Table 2.
Category 1 Site Setbacks, Verification and Notification in areas where local zoning allows for agricultural uses
Total Animal Unit..................................................................................0 - 49
New Operations Non-Farm Residences within Distance...........0-5 within ¼ mile /Expanding Operations 0-7 within ¼ mile
Property Line Setback.........................................................................100 ft
MDARD Site Review and Verification Process ..............................Upon Producer Request............."An Odor Management Plan (OMP) will not be required for these sites in most circumstances. It is however, recommended that all producers develop and implement an OMP in order to reduce odor concerns for neighboring non-farm residents. "
Category 2 sites are those where site-specific factors may limit the environmental, social, or economic
acceptability of the site for livestock production facilities and where structural, vegetative, technological,
and management measures may be necessary to address those limiting factors. These measures should
be incorporated into a
Site Plan and a Manure Management System Plan, both as defined in Section IV,
which are required for all new and expanding livestock production facilities seeking verification. New and
expanding livestock production facilities should only be constructed in areas where local zoning allows for
agriculture uses. Due to the increased density of non-farm residences in Category 2 sites, an OMP is
required for all proposed new and expanding livestock production facilities.
Category 2 Site Setbacks, Verification and Notification – New operations in areas where local zoning allows for agricultural uses
Total Animal Units ................................................................................0-49
For new Operations Non-Farm Residences Within Distance ...6-13 within ¼ mile/ for expanding operations 8- 20 within ¼ mile
Property Line Setback...........................................................................100 ft
MDARD Site Review and Verification Process ................................Upon Producer Request
Pauline and her hubby are so relieved. 
There is no category for a farm with a dozen or so cows, chickens, a goat, or a horse or two. It is all lumped in that one HUGE category! The next category of 5000+ commercial farms is only required 25 more feet than the rest of us. 
